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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第4期6卷 299-304页

作者： TAN, CC FUSCO, VF The Queen's University of Belfast Department of Electrical & Electronic Engineering Ashby Building Stranmillis Road Belfast BT9 5AH U.K. Chun Chia Tan obtained a first-class honours degree from The Queen's University of Belfast. He was awarded an IEE prize for best final-year project. His current research interests include the modelling of electromagnetic fields using parallel processing techniques. At present Mr Tan is working as an electrical engineer in Malaysia. Vincent F. Fusco was educated at The Queen's University of Belfast where he obtained the degree of Ph.D. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a Reader in Microwave Commnications in the School of Electrical Engineering and Computer Science The Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems. He has acted as consultant to a number of major companies and has published numerous research papers in these areas. He is author of the bookMicrowave Circuits Analysis and Computer Aided Design(Prentice Hall 1987). Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the transmission-line matrix (TLM) method used to solve Maxwell's equations is the long computation time required. The TLM scattering calculations involved can, however, be viewed as parallel in nature. This paper describes an effort to reduce computational time by using an SIMD, DAP multiprocessor computer employed to solve a two-dimensional TLM electromagnetic field formulation. A parallel algorithm based on the TLM scattering algorithm is designed and implemented using FORTRAN-PLUS Enhanced on an AMT DAP 510 machine. Here the connectivity of the DAP is exploited to simulate the intrinsic scattering behaviour on which the TLM algorithm relies. The results show that parallel processing on an SIMD machine such as the DAP is advantageous, especially for higher-order mesh sizes.

关键词： Electric lines

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SPECIFICATION AND ANALYSIS OF parallel DISTRIBUTED SOFTWARE AND SYSTEMS BY PETRI NETS WITH TRANSITION ENABLING FUNCTIONS

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IEEE TRANSACTIONS ON SOFTWARE engineering 1992年第3期18卷 252-261页

作者： PAPELIS, YE CASAVANT, TL Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242

This paper investigates a new approach for visually specifying parallel/distributed software using Petri Nets (PN's) extended with Transition Enabling Functions (TEF's). The approach is demonstrated to be useful in the specification of decision-making activities that control distributed computing systems. PN's are employed because of their highly visual nature that can give insight into the nature of the controller of such a system and because of their well-known analytical properties. In order to increase the expressive power of PN's, the extension of TEF's is used. The main focus of this paper is the specification and analysis of parallel/distributed software and systems. A key element of this approach is a set of rules derived to automatically transform such an extended net into a basic PN. Once the rules have been applied to transform the specification, well-known analytical methods can be used to investigate characteristic properties of the system and validate correct operation.

关键词： DISTRIBUTED SOFTWARE parallel SOFTWARE SOFTWARE SPECIFICATION parallel PETRI NETS TRANSITION ENABLING FUNCTIONS CONCURRENCY

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A STUDY OF THE GENERALIZED MORPHOLOGICAL FILTER

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CIRCUITS SYSTEMS AND SIGNAL processing 1992年第1期11卷 229-252页

作者： SONG, JS DELP, EJ 1. Computer Vision and Image Processing Laboratory School of Electrical Engineering Purdue University 47907 West Lafayette Indiana USA

A new class of morphological filters is proposed for image enhancement. The filter, known as the generalized morphological filter (GMF), uses multiple structuring elements and combines linear and morphological operations. The GMF can be designed to suppress various types of noise yet preserve geometrical structure in an image. A study of several aspects of the performance of the filter is presented. The study includes geometrical feature preservation, noise suppression, structuring element selection, and the root signal structure. For the sake of comparison, averaging and median filters are also used in the experiments and corresponding figures of merit of the performance of the filter. The empirical study shows that the generalized morphological filter possesses effective noise suppression with reduced geometrical feature blurring.

关键词： Signal Filtering And Prediction

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A software engineering, visualization methodology for parallel processing systems 16

A software engineering, visualization methodology for parall...

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16th Annual International computer Software and Applications Conference, COMPSAC 1992

作者： Kohl, James Arthur Casavant, Thomas L. Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa CityIA52242 United States

ISBN: (纸本)0818630000

This paper focuses on techniques for enhancing the feasibility of using graphic visualization in analyzing the complexities of parallel software. The central drawback to applying such visual techniques is the overhead in developing analysis tools with flexible, customized views. The PARADISE (parallel Animated Debugging and Simulation Environment) system, which has been in operation since 1989, alleviates some of this design overhead by providing an abstract, object-oriented, visual modeling environment which expedites custom visual tool development. PARADISE is a visual tool which is used to develop other visual tools, or a meta-tool. This paper complements previous work on PARADISE by describing the philosophy behind its design, and how that philosophy leads to a methodology for constructing visual models which characterize parallel systems in general. Emphasis will be on the crucial issues in utilizing visualization for parallel software development, and how PARADISE deals with these issues. © 1992 IEEE.

关键词： parallel processing systems

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The seamless approach to reconciling communication and locality in distributed memory parallel systems

The seamless approach to reconciling communication and local...

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International Symposium on parallel processing

作者： S.A. Fineberg T.L. Casavant B.H. Pease Parallel PrFessin Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

With recent improvements in single CPU performance, several issues become more important in multiprocessor design. Two of these are interprocessor communication and locality. In parallel systems with fast CPUs, locality is vital to performance. However, traditional parallel programming models such as shared memory or message passing do not naturally lead to programs that exhibit locality. In the paper, the Seamless model for interprocessor communication is presented which is based on locality and that allows the programmer to explicitly manipulate a program's locality to optimize performance. Additionally, this model can support latency tolerance with proper hardware support. Extensions to the C programming language that support this model are also presented. Finally, a parallel program utilizing this model is provided to illustrate the paradigm.< >

关键词： Delay Central processing Unit Programming profession Memory management Message passing Concurrent computing Reduced instruction set computing Cache memory Cities and towns parallel programming

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Metrics for metrics: Why it is difficult to compare interconnection networks or how would you compare an alligator to an armadillo?

Metrics for metrics: Why it is difficult to compare intercon...

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1992 Workshop on Future Directions of Massively parallel processing: The New Frontiers

作者： Siegel, Howard Jay Antonio, John K. Liszka, Kathy J. Parallel Processing Laboratory School of Electrical Engineering Purdue University West LafayetteIN49707-1285 United States Department of Mathematical Sciences University of Akron Ayer Hall 325 AkronOH44325-4002 United States

ISBN: (纸本)0818644109

Difficulties associated with metric-based design and evaluation of interconnection networks, in the context of massively parallel processing systems, are discussed from a relatively philosophical perspective. The issues ofwhich metric or weighted set of metrics to usearu how to meaningfully apply metric'are central themes throughout the paper. It is difficult to isolate meaningful comparative network performance measurements when using application benchmarks on different systems. Furthermore, the strong interdependence among application, system, and network parameters makes it difficult to apply the classical experimental method, which is to "measure" the effect of changing one parameter while holding all other parameters constant. The issue of fairness is discussed in the context of the classical experimental method, and one aspect of fairness related to algorithm mapping is illustrated through an example. © 1993 IEEE.

关键词： Benchmarking

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Hardware support for the Seamless programming model

Hardware support for the Seamless programming model

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Frontiers of Massively parallel Computation

作者： S.A. Fineberg T.L. Casavant B.H. Pease Computer Science Corporation USA Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

The communication latency problem is presented with special emphasis on RISC (reduced instruction set computer) based multiprocessors. An interprocessor communication model for parallel programs based on locality is presented. This model enables the programmer to manipulate locality at the language level and to take advantage of currently available system hardware to reduce latency. A hardware node architecture for a latency-tolerant RISC-based multiprocessor, called Seamless, that supports this model, is presented. The Seamless architecture includes the addition of a hardware locality manager to each processing element, as well as an integral runtime environment and compiler.< >

关键词： Hardware Delay Yarn parallel processing Reduced instruction set computing Costs Coprocessors Communication system control parallel architectures Synchronization

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Real-time pattern recognition by joint-Fourier transform correlation

Real-time pattern recognition by joint-Fourier transform cor...

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International Conference on Manufacturing Automation 1992

作者： Poon, Ting-Chung Pieper, Ronald J. Optical Image Processing Laboratory Bradley Department of Electrical Engineering Virginia Polytechnic Institute State University BlacksburgVA24061 United States Department of Electrical and Computer Engineering Naval Postgraduate School MontereyCA93943 United States

Two commonly used optical correlation techniques, matched spatial filtering and joint-Fourier transform correlation, are briefly reviewed. A recently proposed real-time joint-Fourier transform correlation is then disc... 详细信息

关键词： Fourier transforms

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Exploiting concurrency among tasks in partitionable parallel processing systems

Exploiting concurrency among tasks in partitionable parallel...

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International Symposium on parallel processing

作者： W.G. Nation A.A. Maciejewski H.J. Siegel Endicott Engineering Laboratory IBM Corporation Endicott NY USA Parallel Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA

One benefit of partitionable parallel processing systems is their ability to execute multiple, independent tasks simultaneously. Previous work has identified conditions such that, when there are k tasks to be processed, partitioning the system such that all k tasks are processed simultaneously results in a minimum overall execution time. An alternate condition is developed that provides additional insight into the effects of parallelism on execution time. This result, and previous results, however, assume that execution times are data independent. It is shown that data-dependent tasks do not necessarily execute faster when processed simultaneously even if the condition is met. A model is developed that provides for the possible variability of a task's execution time and is used in a new framework to study the problem of finding an optimal mapping for identical, independent data-dependent execution time tasks onto partitionable systems. Extension of this framework to situations where the k tasks are non-identical is discussed.< >

关键词： Concurrent computing parallel processing Large-scale systems Laboratories Signal processing algorithms Signal processing Satellites Computational modeling Histograms Oceans

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A software engineering, visualization methodology for parallel processing systems

A software engineering, visualization methodology for parall...

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： J.A. Kohl T.L. Casavant Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Iowa Univ. Iowa City IA USA

The authors focus on techniques for enhancing the feasibility of using graphic visualization in analyzing the complexities of parallel software. The central drawback to applying such visual techniques is the overhead in developing analysis tools with flexible, customized views. The PARADISE system alleviates some of this design overhead by providing an abstract, object-oriented, visual modeling environment which expedites custom visual tool development. PARADISE is a visual tool which is used to develop other visual tools, or a meta-tool. The authors complement previous work on PARADISE by describing the philosophy behind its design, and how that philosophy leads to a methodology for constructing visual models which characterize parallel systems in general. The emphasis is on the crucial issues in utilizing visualization for parallel software development, and on how PARADISE deals with these issues.< >

关键词： Software engineering Visualization parallel processing Animation Object oriented modeling Power system modeling Debugging Programming Laboratories Cities and towns

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